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Exams > 2020 Q100 — EOP-TRIP-1 FRHS-1 Transition

2020 Q100 — EOP-TRIP-1 FRHS-1 Transition

⚠️ DRAFT
Q100 — EOP-TRIP-1 FRHS-1 Transition G2.4.14 (4.5)
Given:
Unit 2 was initially operating at 100% Power when the following sequence of events occurs;
  • The reactor trips.
  • A valid demand for Safety Injection occurs.
  • The crew enters 2-EOP-TRIP-1, Reactor Trip or Safety Injection.

Subsequently, the following occurs;
  • 23 AFW Pump tripped on overspeed and cannot be reset due to trip throttle valve damage.
  • 21 AFW Pump is tagged out for impeller replacement.
  • 22 AFW Pump has tripped on motor overcurrent.
  • All Steam Generator NR Levels are < 9%.
  • All Steam Generator Pressures are stable.

Which ONE of the following indicates the proper procedural usage of the Emergency Operating Procedures (EOPs)?

Note: 2-EOP-FRHS-1, Loss of Secondary Heat Sink
         CFST, Critical Safety Function Status Trees
A. Immediately transition to 2-EOP-FRHS-1.
B. Complete all immediate actions of 2-EOP-TRIP-1, then transition to 2-EOP-FRHS-1.
C. Continue to perform 2-EOP-TRIP-1 until directed to transition to 2-EOP-FRHS-1.
D. Continue to perform 2-EOP-TRIP-1 until CFST monitoring is directed, then transition to 2-EOP-FRHS-1.
▶ Show Answer & Explanation
✓ C. Correct. Step 20 of EOP-TRIP-1 specifically directs the implementation of EOP-FRHS-1 when aux feed flow cannot be established.
✗ A. Plausible because the candidate may believe that CFSTs are applicable as soon as EOP-TRIP-1 is initiated.
✗ B. Plausible because OP-AA-101-111-1003, Use of Procedures states; "continuous required actions apply as soon as the immediate actions are verified." Incorrect as the TRIP-1 procedure CAS statements do not include a transition to FRHS-1.
✗ D. Plausible because OP-AA-101-111-1003, Use of Procedures states; "the functional restoration transitions apply only after EOP-TRIP-1 specifically directs the operator to begin monitoring the Critical Function Status Trees." This is step 30 of EOP-TRIP-1. Incorrect as both FRSM and FRHS both have specific CFST transitions before step 30.
Ref: OP-AA-101-111-1003, Use of Procedures. 2-EOP-TRIP-1, Reactor Trip or Safety Injection and bases | LO: N/A | Source: Bank – Salem Vision Database | Cognitive: Fundamental

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